There's a lot of good stuff on the internet. More information than we had access to as kids. Better to raise them to be responsible, well adjusted humans than to shield them from reality.
Do they need access to that information at the age of 4 though? Almost certainly not. They don't even have basic reading proficiency until age around age 7 or 8. Kindergarten is still mostly focused on phonics.
This is completely wrong. Kids can easily learn to read at age 5. A child who is working on "basic reading proficiency" at 8 is very behind and has not been well-served by the people responsible for raising them.